Is it possible to assign a static IP to an AWS load balancer without the need to move your NS records to Route 53?
I basically just want to create an A record from my domain to point to the ELB.
Elastic Load Balancer is a distributed system. It does not have a single public IP address. Instead, when you create an ELB, you are given a DNS name such as ExampleDomainELB-67854125.us-east-1.elb.amazonaws.com.
Amazon gives a facility to set up a DNS CNAME entry pointing for e.g. www.exampledomain.com to the ELB-supplied DNS name.
Also, ELB is directing to one of your instances. Hence, creating a static IP address for ELB will not be feasible.
So as a solution if you need to set your 'A' record from your domain pointing to your ELB in Route53 :
Select 'Yes' for Alias.
Set Alias target as your Load Balancer DNS.
Second way is similar by selecting the CNAME in Route53 and pointing the Alias Target to your ELB.
This should help.
AWS Load Balancer is a very generic term.
You currently have three options for load balancing in AWS:
Application Load Balancers (ALB)
Network Load Balancers (NLB)
Classic/Elastic Load Balancers (ELB)
Of those three only one, the Network Load Balancer can have a static IP address. It's listed in the reference below.
Support for static IP addresses for the load balancer. You can also assign one Elastic IP address per subnet enabled for the load balancer.
It is also possible to "glue" an NLB and ALB together to provide a static IP address and application load balancer functionality. In general you allow a lambda to populate an NLB Target group with your ALB info. It's outside the scope of this answer but the link is below.
If you're using Route53 you can create an A record Alias for your Load Balancer.
If you're not, you can use a CNAME.
References
https://docs.aws.amazon.com/elasticloadbalancing/latest/network/introduction.html
https://aws.amazon.com/blogs/networking-and-content-delivery/using-static-ip-addresses-for-application-load-balancers/
ELB manage the IP for you, it just gives you the DNS name. So you can't control the IP behind it.
If you need an A record than you need to use A record alias from Route53.
Without using Route 53, you can use CNAME instead of A record.
Related
I have two same task in a service.
this task has the httpd.
It has different IP address 56.XX.XX.12,56.XX.XX.15
I can access both address and get response. 56.XX.XX.12,56.XX.XX.15
Now I try to attach original domain name to this fargate though, from my understanding, I should access to LoadBalancer IP address and LoadBalancer select the target task automatically am I wrong?
If so where can I find the LoadBalancer IP?
From the AWS documentation:
The IP addresses for Classic Load Balancers and Application Load Balancers change over time. Avoid using this information to statically configure your applications to point to these IP addresses.
You should use the provided DNS name of the LoadBalancer instead.
Now I try to attach original domain name to this fargate though, from my understanding, I should access to LoadBalancer IP address and LoadBalancer select the target task automatically am I wrong?
AWS elastic/application load balancers do not have a static IP, they are associated with AWS DNS name to expose application.
From the AWS Docs.
use your DNS service, such as your domain registrar, to create a CNAME record to route queries to your load balancer. For more information, see the documentation for your DNS service.
CNAME records allow you to route traffic to other resources using the domain names. Refer to the docs for more information.
AWS Docs on linking Custom DNS with load balancers: https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/using-domain-names-with-elb.html#dns-associate-custom-elb
I have set ALB with fargate, currently I can access to ALB with dns name like this
myapp-LoadB-FDEWFSOAQXD4-f18c75dd4249a10d.elb.ap-northeast-1.amazonaws.com
However it is said this DNS could be changed.
So I want to give this the Elastic IP
I have experienced connection EC2 and Elastic IP.
In Elasitc IP panel I can choose instance.
However, there is not ALB is listed.
How can I set Elastic IP to ALB ? or am I wrong basically?
Two options here, depending on what kind of direction you are heading:
If you do not like the default DNS name
You can create a DNS record that will point to your load balancer. This means that people would be able to surf to your website by using www.whitebear.com instead of myapp-LoadB-FDEWFSOAQXD4-f18c75dd4249a10d.elb.ap-northeast-1.amazonaws.com
See: Routing traffic to an ELB load balancer - Amazon Route 53
If you really want to attach an ElasticIp to a loadbalancer
There are some use cases where it is really needed to be able to surf to a loadbalancer using a fixed IP. You can achieve this by setting up a Global Accelerator on AWS.
With Global Accelerator, you are provided two global static public IPs that act as a fixed entry point to your application, improving availability.
More information can be found on the AWS Global Accelerator page
If you wish to create a 'friendly' name for an Application Load Balancer, you can create a CNAME record in your Domain and point it to the DNS Name of the Load Balancer.
If you wish to point the Apex of your domain (eg example.com), you can use an Alias in Amazon Route 53 to point to the Application Load Balancer. (It is not normally possible to point a Domain apex to a CNAME record, so the Alias capability of Route 53 will do it for you.)
See: Routing traffic to an ELB load balancer - Amazon Route 53
I have configured classic load balancer for my application and provided dns URL for it to the customer for integration.
Now i want to migrate to Application load balancer but that will lead to change in DNS url for my customer.
So if I get a static IP , i can associate it to my CLB now , as customers to migrate to that IP and then associate the IP to ALB.
is there any way it can be handled better.
No, only Network Load Balancers offer the option of a static IP. You should probably be setting up your own DNS name that points to the load balancer, and giving that to your customer. Then if your load balancer's DNS were to ever change you would only need to update your own DNS record.
We have a subdomain under our company domain for our application: myapp.company.com.
Few years ago the following setup was done
myapp.company.com points to an elastic IP (done by the company IT)
elastic IP targets an public internet facing EC2 instance
Now I'm trying to find a way to switch that setup so it make use of a classic load balancer.
I created an internet facing classic load balancer
is in the security group of the VPC in which the instance is
targets the instance which is currently reachable through the elastic ip
I'm able visit the web apps on the instance through the load balancer with the public ip defined in
the network interface of the load balancer.
After that, I thought a hosted zone would do the trick of routing the calls to myapp.company.com to the load balancer.
So I created a hosted zone
domain name when creating the hosted zone: myapp.company.com
added an A record which has the load balancer's dns name as alias target
But the load balancer is not used.
If you are going to use Classic Load Balancer, you need to make a note of the string from ELB DNS name (for example, my-load-balancer-1234567890.us-west-2.elb.amazonaws.com). After that, ask your IT support to modify DNS record for myapp.company.com to CNAME which points to ELB:
myapp.company.com CNAME my-load-balancer-1234567890.us-west-2.elb.amazonaws.com
(creating the hosted zone in AWS Route53 will only work after someone (zone owner, so probably IT) delegates authority for your (sub)domain to your AWS name servers, and it is most probably not worth doing just for the sake of one record)
It sounds like I cannot use an elastic ip with AWS Application Load Balancer.
I currently own a domain through GoDaddy and the DNS server points to the load balancer via the CNAME. However, if the load balancer dies and gets recreated, its url changes and I then have to change the CNAME and wait for the change to propagate.
There must be a solution around this - what is it?
It looks like the solution might be to use two load balancers - https://aws.amazon.com/blogs/networking-and-content-delivery/using-static-ip-addresses-for-application-load-balancers/, but this seems really excessive - I have a small application right now.
As far as I know, the only way to have a fixed static-IP for a LB is to use a Network Load Balancer.
As stated here
Support for static IP addresses for the load balancer. You can also assign one Elastic IP address per subnet enabled for the load balancer.
An Elastic Load Balancer retains its DNS name as long as you don't replace it manually. If you still want to have a temporary, low-cost solution to this problem, you can consider the following approach:
Assuming the application is deployed in a private subnet, I would proxy the traffic through an EC2 instance until your primary DNS changes propagate.
Launch a small EC2 instance and attach an Elastic IP to it (consider your bandwidth requirements to determine which size).
Configure a proxy (nginx) to forward traffic to your application.
Configure active-passive DNS failover using ELB DNS name and EIP.